National Geographic Duet/6002 Talk Abroad Unlocked Phone with 1 GB Memory, 2.0 MP Camera, Video, TV, USB, Bluetooth, MicroSD Slot, National Geographic Wallpapers, Ringtones and SIM Card Service--International Version with Warranty Unlocked tri-band GSM cell phone compatible with 900/1800/1900 frequencies; includes international prepaid SIM card for GSM phones with low calling rates Dual SIM card capability--add an additional line to complement the National Geographic Talk Abroad Service One phone number in all destinations (UK phone number provided); can add optional second SIM card for local calling Provides coverage in more than 150 countries, with unlimited free incoming calls in over 80 countries 30 minutes of initial call credit to the United States; includes voice mail, text messaging, and 24/7, U.S.-based customer support